Methods for designing lobe-type rotors

Abstract

The present invention provides a method for designing lobe-type rotors which enables a defined rotor and a conjugate rotor having three or more than three lobes intermeshing and conjugating to each other and by setting suitable parameters to generate curve portions of a single lobe of the defined rotor as a pattern including a curve E, an arc A, an arc B, an arc F, and a straight line Y; the main feature of the present invention is that a radius rB of the arc B is defined by following equation: rB+(R-rB)⁢sin⁢ ⁢α=D2rB=D / 2-R⁢ ⁢sin⁢ ⁢α1-sin⁢ ⁢αmoreover, the straight line Y is the external common tangent line of the arc B and the arc F, and respectively getting two tangent points therefrom to be defined as two end points of the straight line Y.

Description

1. REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation-in-part application of U.S. patent application Ser. No. 11 / 214,876 filed Aug. 31, 2005, the entire contents of the above mentioned application being incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to methods for designing lobe-type rotor. By setting suitable parameters, the method can profile a defined rotor and a conjugate rotor with three or more than three lobes which intermesh and conjugate to each other, and effectively evaluate optimum performance in intermeshing and conjugating, whereby to provide higher compression ratio and larger discharge capacity, secure a smooth process while working chamber undergoing compression and expansion, and reduce leakage, thus can lessen noise and vibration while operation of the rotors. [0004] 2. Related Art [0005] A large variety of related lobe-type rotor mechanism are already know...

AI Technical Summary

Benefits of technology

[0007] Accordingly, an object of the present invention is to provide a method for designing lobe-type rotors which is able to generate a defined rotor and a conjugate rotor both with three or more than three lobes intermeshing and conjugating to each other by different parameters. The rotors generated by way of the method can provide higher compression ratio and larger discharge capacity as apply to machines for periodical expansion and compression operation, secure a smooth process while working chamber undergoing compression and expansion, and which reduce leakage as well reduce noise and vibration.

Problems solved by technology

The rotors of the prior arts have drawbacks that curves of each lobe of the rotors are not continuously and smoothly connected between each segment; such drawbacks cause tips of the rotors do not mesh completely with other rotor when they are rotating.

Consequently, in applying to machines working as periodical expansion and compression operation, the abnormal situations such as noise and vibration take place in working chamber enclosed by a defined rotor, conjugate rotor and inner walls of cylinder.

Moreover, inappropriate intermeshing between the rotors increases wear and therefore reduces the durability of operation.

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